CB7 and CB8 Asphalt Compactor Propel System Caterpillar

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Diesel engine exhaust contains products of combustion which may cause personal injury. Always start and operate the engine in a well ventilated area, and, if in an enclosed area, vent the exhaust to the outside.

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Personal injury or death can result from sudden machine movement. Sudden movement of the machine can cause injury to persons on or near the machine. To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before operating the machine.

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Personal injury can result from rotating and moving parts. Moving fan blades and moving parts will throw or cut any object or tool that falls or is pushed into them. Make sure no one is working on, underneath or close to an engine that is running. Make sure the area is free of personnel.

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Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.

Note: Perform "Relief Valve (Charge) Test and Adjust" before "Relief Valve (Main) Test and Adjust".

1. Drive the machine to a smooth, horizontal surface.
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   Illustration 1	g06160408

2. Move propel lever (1) to the NEUTRAL position.

3. Move parking brake switch (2) to the ON position.

4. Place the engine in ECO mode or low idle.
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   Illustration 2	g06148038

   1. Select "Main Menu" (3) on the machine display.

   2. Select "Machine Setup" (4).
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      Illustration 3	g06148261

   3. Select "Engine Spd Sw" (5).
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      Illustration 4	g06148286

   4. Select "ECO" (6) or "Low" (7).
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   Illustration 5	g06160422

5. Move engine start switch (8) to the OFF position.
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   Illustration 6	g06160385

6. Unlock latch (9) and open engine compartment door (10) on the right side of the machine.
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   Illustration 7	g06160775

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   Illustration 8	g06160779

7. Disconnect brake supply hose assembly (11) from all four motors. Use Tool (E) to cap the port. Use Tool (D) to plug the hose.

8. Assemble the tooling. Connect Tool (B) to Tool (C). Assemble two sets of tooling.

9. Connect both sets of Tool (B) to Tool (A).
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   Illustration 9	g06165832

10. Connect Tool (C) to port "Mb" (12) on the propel pump.
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    Illustration 10	g06165835

11. Connect other Tool (C) to port "Ma" (13) on the propel pump.

12. Move engine start switch (8) to the START position. Release the switch when the engine starts.

13. Place the engine in high idle.

14. Operate the hydraulic system until the oil temperature reaches the test temperature of 45 °C (113 °F).
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    Illustration 11	g06165843

15. Use speed control switches (14) to set the propel speed to 50 percent.

    Note: Two things indicate when the propel speed is set to 50 percent. First, "Speed Control % 50" will appear on the display. Second, four LEDs next to speed control buttons (14) will be illuminated.

16. Move parking brake switch (2) to the OFF position.

17. Modulate propel lever (1) reverse until the peak pressure is registered (approximately one half of the total travel). Record the pressure at port "Ma" (13). The pressure should be 42500 ± 2000 kPa (6164 ± 290 psi).

18. Modulate propel lever (1) to forward until the peak pressure is registered (approximately one half of the total travel). Record the pressure at port "Mb" (12). The pressure should be 42500 ± 2000 kPa (6164 ± 290 psi).

19. Move propel lever (1) to the NEUTRAL position.

20. Place the engine in ECO mode or in low idle.

21. Move parking brake switch (2) to the ON position.

22. Move engine start switch (8) to the OFF position.

23. If either the forward pressure or the reverse pressure was outside the specified range, go to Step 24. If both the forward pressure and the reverse pressure are inside the specified range, go to Step 27.
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    Illustration 12	g06165847

24. If the reverse pressure is outside the specified range, "Ma" relief valve (16) must be cleaned or replaced.

25. If forward pressure is outside the specified range, "Mb" relief valve (15) must be cleaned or replaced.

26. Go to Step 12.
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    Illustration 13	g06165850

27. Disconnect Tool (C) from port "Mb" (12). Connect Tool (C) to port "Mc" (17).
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    Illustration 14	g06165853

28. Disconnect Tool (C) from port "Ma" (13). Connect Tool (C) to port "Md" (18).

29. Move engine start switch (8) to the START position. Release the switch when the engine starts.

30. Place the engine in high idle.

31. Operate the hydraulic system until the oil temperature reaches the test temperature of 45 °C (113 °F).

32. Move parking brake switch (2) to the OFF position.

33. Modulate propel lever (1) reverse until the peak pressure is registered (approximately one half of the total travel). Record the pressure at port "Mc" (17). The pressure should be 42500 ± 2000 kPa (6164 ± 290 psi).

34. Modulate propel lever (1) to forward until the peak pressure is registered (approximately one half of the total travel). Record the pressure at port "Md" (18). The pressure should be 42500 ± 2000 kPa (6164 ± 290 psi).

35. Move propel lever (1) to the NEUTRAL position.

36. Place the engine in ECO mode or in low idle.

37. Move parking brake switch (2) to the ON position.

38. Move engine start switch (8) to the OFF position.

39. If either the forward pressure or the reverse pressure was outside the specified range, go to Step 40. If both the forward pressure and the reverse pressure are inside the specified range, go to Step 43.
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    Illustration 15	g06165864

40. If the reverse pressure is outside the specified range, "Mc" relief valve (19) must be replaced.

41. If the forward pressure is outside the specified range, "Md" relief valve (20) must be replaced.

42. Go to Step 29.

43. Remove Tool (C) from port "Mc" (19) and Tool (C) from port "Md" (20).

44. Remove Tool (D) from brake supply hose assembly (11) at the drum propel motors. Remove Tool (E) from the brake inlet port at the drum propel motors. Connect brake supply hose (11) to the brake inlet ports on the propel motors.

45. Close engine compartment door (10) on the right side of machine and secure latch (9).